I am making updates to an indesign document someone else created. There are two small tick marks in all 4 corners of the page (one vertical and one horizontal). The creater advised they were bleed marks. However, I looked in the Document Setup and found that the bleed/slug are both set at 0pt. I have done a lot of research and digging online without success. I also tried to look at the margins/guides, etc and did have much luck. Do you know what could be causing this? I would really like to remove them.